Conceptual Physics (12th Edition)

by
Hewitt, Paul G.

Published by
Addison-Wesley

ISBN 10:
0321909100

ISBN 13:
978-0-32190-910-7

Chapter 31 - Think and Explain: 54

Answer

h = zero.

Work Step by Step

The size of a quantum of light energy is hf. If the discretized energy of light were to instead become continuous, that would be akin to taking the limit as h approached zero. In the same way, the de Broglie wavelength of massive particles, h/p, would also become zero.
In short, in a world with no quantum effects, Planck’s constant h would be zero.